Calculate GST (Goods and Services Tax) instantly with our free tool. Enter any amount, select the GST rate (5%, 12%, 18%, or 28%), and see the tax breakdown including CGST, SGST, and IGST components — all formatted in Indian Rupees.
Two modes: Add GST to get the total price from base amount, or Remove GST to find the base price from a GST-inclusive amount. Toggle between Intra-state (CGST + SGST) and Inter-state (IGST) to see the correct tax split for your transaction.
How to Use This Calculator
- Enter the amount (base price or GST-inclusive price).
- Select the GST rate: 5%, 12%, 18%, or 28%.
- Choose Add GST or Remove GST mode.
- Toggle Intra-state/Inter-state for CGST+SGST vs IGST split.
- Click “Calculate GST” to see the complete breakdown.
GST Rate Quick Reference
| GST Rate | CGST | SGST | IGST | Common Items |
|---|---|---|---|---|
| 5% | 2.5% | 2.5% | 5% | Packaged food, footwear (<₹1000), transport |
| 12% | 6% | 6% | 12% | Smartphones, processed food, business class air tickets |
| 18% | 9% | 9% | 18% | Most goods & services, electronics, restaurants (AC) |
| 28% | 14% | 14% | 28% | Luxury items, cars, tobacco, aerated drinks |
CGST + SGST applies for intra-state (within same state) transactions. IGST applies for inter-state (between different states) transactions.
Frequently Asked Questions
How to calculate GST from total amount?
Use “Remove GST” mode. Enter the total (GST-inclusive) amount and select the GST rate. The formula is: Base Amount = Total Amount × 100 / (100 + GST%). For example, removing 18% GST from ₹1,180 gives base amount ₹1,000 and GST ₹180.
What is the difference between CGST, SGST, and IGST?
For transactions within the same state, GST is split equally into CGST (Central GST) and SGST (State GST). For inter-state transactions, the full amount is charged as IGST (Integrated GST). The total tax rate remains the same.
Which GST rate applies to my product or service?
5% GST applies to essential items, 12% to standard goods, 18% to most services and products, and 28% to luxury items and demerit goods. Check the HSN/SAC code for your specific product or service on the official GST portal.